Sigma lens refresh likelyhood (150-600S; 120-300S)

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Sigma lens refresh likelyhood (150-600S; 120-300S)

Does anyone know whether sigma has a semi regular schedule on which they put out updated versions of their lenses? I'm fairly certain my next lens will be a 120-300 (For use on my D500 / future D850), but since the lens has been out for 5 years or so it would be good to know if it is scheduled for replacement. Long term I would also like to replace my 150-600C with one that is sharper wide open at 600 (At F8 the C is fantastic).

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